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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e531a1d3e02d18c9a7b362667ed2117cdb530540956eed931cfe2113408c4d96' 
  AND token = 'BxDRZ811RGirNtDSCe1R31OzmAnDVoYf9NCU6RwMFYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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