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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7814fbbc174b294b1c1b2d46f19e043d01bb2e227f23423320bff7ee46ab3f83' 
  AND token = '9OgcY4Xvx40WfvFQDoyszcewapgwoV8c5lOrPoChaso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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