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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbd7543b768516a0be2033e7b0518906f68d833293b7e511af377410f85ec89' 
  AND token = 'gohznqpEe1vLTLSueaDpMElVv7YGvYaPE8f3/J7G4v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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