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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef0d01146ce71e7a69f2fb474d9cde9944e06d26691cb5bc866de44a7334613' 
  AND token = 'TsGeaYiXEk9F3/Rdu1O4nwdAE4vQdWH54Hl9thY7v3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}