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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b7d56e6e6f41bed68a2f28333f89d59d998c25f90f021c9a0650349977e5d0' 
  AND token = 'SVQCxS3q4gnh9fIoEyCnTsTYmTctobFiimpemtD/0j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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