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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699912e07e483d06b18c4054485610c129c6fb70173e52e2ea327451d65e7501' 
  AND token = '9ZwD1hYFvCdFHFzMnKC/lE/6mdH2WlcYTwFn1VFzxeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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