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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01fffc530c834fab7600a0fa4d0aecbfc89d7527cc9decc3bbfdd17ec9b06b0' 
  AND token = '5nMO7KSqhGb095QbU2c3ObxM7yuMG5/nPhgqFMiLYPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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