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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bbee5970283534cadc3293ae634dd0266a35ebeccded5679925d0d3a6aa4a0' 
  AND token = '8ZnhWFrqqwb+6amasZ1TLqI34Fh/ABoXJLs/4cwDbtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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